Twitter Tools not updating tweets (3 posts)

Using Twitter Tools 1.2b1 it hasn't picked up my last tweet from yesterday and I can't get it do so no matter what I try! My site is here with the Twitter Tools widget on the left hand side. I had 1.5b3 installed previously so downgraded to 1.2 but it still won't pick up the latest tweet.

OK, back to the latest version and have reset and tried to manually update but still no joy. I also spotted this post right next to mine that certainly looks related (although I've been running under 2.6 for a while and it was working OK).